Fatal error: Uncaught Error: Call to undefined function mysql_connect() in C:\phpstudy_pro\WWW\formal\e\class\db\db_mysql.php:15 Stack trace: #0 C:\phpstudy_pro\WWW\formal\e\class\connect.php(156): do_dbconnect('127.0.0.1', '', 'root', 'rooy@#xiaoli88', '0306') #1 C:\phpstudy_pro\WWW\formal\e\public\ViewClick\index.php(4): db_connect() #2 {main} thrown in C:\phpstudy_pro\WWW\formal\e\class\db\db_mysql.php on line 15